Product Introduction
DC metal oxide surge arresters are used in DC power supply systems to protect DC electrical equipment from damage caused by overvoltage. The product is designed and produced based on two standards drafted by our company, NB/T 42049-2015 "Gap free Metal Oxide Surge Arresters for DC Systems of 3kV and Below" and GB/T 25890.5-2010 "DC Switchgear for Rail Transit Ground Equipment Part 5 DC Surge Arresters and Low Voltage Limiters" (EQV IEC61992-5). It also refers to the requirements of international power grid technical report Cigre 33/14.05 and GB/T 22389-2008 "Guidelines for the Use of Gap free Metal Oxide Surge Arresters in High Voltage DC Converter Stations", combined with the production status of DC surge arresters at home and abroad and our company's years of experience in lightning arrester design and production. The structure is reasonable and the performance is reliable. The resistor adopts our company's independently developed DC metal oxide resistor, which has low residual voltage, high withstand level of impulse current, high energy absorption capacity, and low power loss during operation under DC voltage. The composite jacket is formed in one step using the integral molding vulcanization process, with good sealing performance and long service life of the lightning arrester. A configurable disconnector can be used to shut down the lightning arrester when it is damaged and provide a clear indication to prevent grounding faults, making the system safer. It can also be configured with a residual voltage counter according to needs, without raising the residual voltage of the lightning arrester, making the equipment safer. The LCD display provides intuitive and clear readings, comes with a built-in power supply, has high integration, small size, fully sealed structure, and is suitable for both indoor and outdoor use; The comprehensive type test (including 40kA short-circuit current test) has been passed by the National Quality Supervision and Inspection Center for Insulated Surge Arresters. The product has been in operation for many years in major domestic urban rail transit systems such as Beijing, Shanghai, Guangzhou, Shenzhen, Chongqing, Nanjing, Chengdu, Hangzhou, Harbin, Changchun, Shenyang, Hong Kong, and Xi'an, as well as in foreign urban rail transit systems such as Ethiopia, with good protection and reliable products.
